Pulp-screen.



R. S. CLARKE.

PULP`SCREEN.

APPLICATION F|LED1uN26.1916.

Patented Jan. 2, 1917.v

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R. s. CLARKE.

PULP SCREEN.

APPLlcATxoN FILED JUNE 26.1916.

Patented- Jan-2,191?.

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PULP SCREEN. APPLICATION FILED IUNEZB, I9IB LBQQU Patented Jan. 2, 1917.

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RALPH S. CLARKE, OF AST WALPOLE, MASSACHUSETTS, ASSIGNOR TO BIRD MCHINE COMPANY, A CORPORATION OF MASSACHUSETTS.

PULP-SCREEN.

Lawson.

Specification of Letters Patent. Pgagnted Jimi. i917.

Application filed J' une 26, 1916. Serial No. 105,956.

Olie of the ob'ects of this invention is to so construct a pulp screening machine that a mixture of pulp and water may be supplied to the machine in or approximately in K the general direction in which precipitation of'foreign matter may Voccur and that vibration of said pulp, to facilitate the screening action, may be effected in directions substantially transverse to said direction of supply, and also transversely of said direc" tion of precipitation.

Another object of the invention is to improve the construction of pulp screens and particularly of such screens in which the vibratory or similar action on the pulp is effected .through `an instrumentality other than or complemental to the screen.

Other objects of the invention will appear from the following description...

The invention consists in the means for supplying the pulp in the direction or substantially inthe direction in which precipitation of matterv may occur and in mechanism for agitating the pulp.

The invention also consists in such othernovel features of construction and combination of parts as shall hereinafter be4 more fully described and pointed out in the claims. f

Figure 1, represents a plan view of the improved pulp screening machine. Fig. 2, represents a longitudinal section of parts of the same as takenon line 2 2 Fig. 1. Fig. 3, represents a cross sectional view ofthe machine as taken on line 3-3 Fig. 1.

Similar characters of reference designate corresponding parts throughout.

As shown in the drawings 5 indicates the base of the machine having or sustaining the end frames 6 and 7. The end frame 6 has an opening which is defined by the 55 collar 8 and has the flange 9 extending outwardly from said frame ,6 andthe ianges 10 and 11 which extend inwardly from said frame 6, that is. toward the frame4 7. This latter frame 7 has the inwardly-V extending flange 12 and the bearing 13 vand-is furnished with the bearing bracket 14.

To the flange 9 of frame 6 1s secured the head 15 having the inwardly extending iiange 16 and the outlet 17 Vwhich communicates with the usual box 18 which receives the screened pulp and delivers the same for the purposes of its use directly to the paper making machine or to some intermediate mechanism.

Head 15 andthe portion of frame 7 defined by flange 12 constitute the ends of a tank, vat or container of which the sides andbottom are formed by the wall 19 the ends of which respectively are connected with the iianges 11 and 12 by the joint members 20 and 21 of rubber or other suitable iexible material. At its lower portion said wall 19 has the slot or opening 22 which extends longitudinally of said wall and communicates with the drain channel or member 23- ixed to wall 19 and having the outlet 24 which is adapted to be connected with a suitable means to convey the material passing from saidoutlet to some desired point.

Wall 19 and its member 22 are sustained by the pair of frames 25, 25 of approximately U-shape, as shown in Fig. 3 of the drawings, and partially supported at one side of the machine by somewhat flexible 'I members orstandards as 26 which are fixed 90 to said frames ,25, 25 and to brackets 27, 27 mountedA on the machine base 5. At that side of the bed plate 5 remote from the brackets 27 ,'27 are mounted the standards.` 28, 28 which support the shaft 29 carrying-"e5 the link 30 which has a bearing to receive the shaft 31 mounted in the frames 25, 25 at this side of the machine. Link 30 has the downwardly extending arm 32 which is engaged by the frame 33 pivotally mounted on the connecting rod 34 which'has the strap or bearing 35 operatively mounted on the eccentric 36 of the shaft 37 journaled in bearings of the brackets 27, 27 and adapted to be operated in any usualmanner.

Within the wall 19 is the cylindrical screen member 38 of any usual construction as to permitting the passage through openings 39, 39 in its wall of water and pulp of the desired fneness. This screen 38 is 110 20 trough 44 and above this trough 44 is lo-v mounted atione end on the head 40 having the bridging elements 43 and 44 whichv may be of rubber or other preferably flexible material. It will thus be seen that fluid 'or similar material entering the cylindrical screen through the interstices of its Wall l I will discharge through the member 42 and outlet `17 of head 15 into the box 18. Extending from a point-within the screen 39, closely adjacent to the head 40,. out through the open funnel member 41 is the cated the shower lpipe 45 adapted to direct .water in jets upward against the wallof said screen whereby said jets of water in passing through the interstices of the wall of '.-the screen may loosen land carry with them particles'of pulp or foreign matter adhering to-y the exterior o f the screen.

Ay cons iderable proportion ofthe material thus loosened and carried upward by' the jets of water from pipe 45-enters- .between the walls 46, 46 of the troughs .47, 47 located above the screen and strikes the deflector 48 which directs them into said troughs 47 47 fromwhence they pass through .pipes 49,49 into .thetrough 44. vSuch matter and water asis not thusjcaught by said troughs l 47, 47 v either is washed from the screen 39 or fallsiirto the trough 44. and is conveyed from the machine. `The pulpy or other f material -to Abev l screened, by this machine, mixed with water,

is :supplied from the trough or-troughs 50,v

50 which are located above' the tank or vat formed by the wall 19 and. have discharge or outlet slots`51, 5 1 extending or delivering in directions, preferably vparallel to said wall and tothey wall ofthe screen 39 but at least in the general direction in which' gravitation or setting of heavy matter toward the out-A letslot 22 of the vat .occurs and, also it may be noted, that Such delivery of material and carrying the pulp to be treated, and usually. more or less foreign matter,l is supplied .to the troughs 50, 50 and is delivered through. Ltheyslots 511,51 thereof, as approximately the flow vof the same between the wall l19 and the screen 39 is transverse to the direction of agitation throughthe action of' said wall 19.

I-n thev operation of the. machine water vertical sheets or streams, between ythe .sides of the wall'19 and in directions p'arallelto the outlet slot. 22 of the vat, constituted. by said wall 19. The flow of said water and let slot 2 2.

materialcarried thereby through the 'outlet 24'is or 'may be controlled by any well know-n means which does not in itself form part of the present invention. AAs a result of such supply the water and material partially fills `the vat constituted by the wall 19 and some part of said water and the finer pulp.passes through the interstices of the screen 39 and vmay ultimately'overflow.through the funnely 42 and outlet 117 intothe box 18 for use. Some prop'ortionof the foreign matter carried by the water is of such character or specific gravity that it hasa tendency to' settle through. thev water and such matter in moving downward from 'the slots 51, 51 acquires inertia N vhi'ch4 is. not -positivelyop` posed by 'any part of the machine and which said foreign matter passesthrough the out;

During someportion orl the whole period in which the water and material is suppliedto the machine through the slots 51,' 51 shaft 41.is caused to rotate. This rotation of shaft tends to facilitate the passagel of said for? i' eign matter downward'throughthe water-- between the wall' 19 and the screeh'39 until? 41 effects 'the' reciprocatory motionf'of the and its top 35 which motion is transmitted to larm 32 by frame 33 to effect oscillation of vlink 30 and -vibratory motion of frames 25,-V

'connecting rod 34 through the eccentric 36 f i 25 and the-vat'cons'titutedbywallv 19 in a direction generally transverse to the axis of the screen 39 and also transverse to the iiow of materialat and for a time after such material enters between the vibratory 'members constituted by the upwardly extending por-l tions of wall '19. @ne of the vvresults of thus effecting thevibration or agitation of' the material is that the.'motion of the water tendsto loosen particles of pulp. which adhere to the screen 39 and to force a large proportion of the pulp, of suitable size,

through the interstices of the screen to theinterio-r of said screen. Another 4result of such agitation ofthe 4material is that the heavier foreign `matter seeking .to settle is freed from engagement with particles of.

pulp and allowed to move downward.

In order to assist in-clearing the exterior ofthe screen 39 from pulp gathered thereon and to Cleanthe interstiees of thescreen,

said screen is caused' to rotate to subjectl its wall progressively -tolthe action. ofthe jets of'water directed upwardlyfrom the shower pipe 45. Such jets of water pass through the interstices ofthe screen wall and 'carry with'them-most of the pulpy material adher- `ingtothev exterior of the screen. Some of I such loosened material falls back into the vat and other portions o f the material 'are carried by the force of the water jets vinto the troughs 47,47 as'above described.

It is to be understood that the wall 19 has i `the function of a vibrator member as well as ramene that of a container or vat and that the action of said wall 19 relative to the floW- of the pulp or material di'ers from the ordinary vibrating vat.

While I have herein described apparatus of a somewhatA speciic construction it isnot my intention thereby to limit my invention except as herein claimed.

Having thus described my inventionA I claim as new and desire to secure by Letters f Patent. i

1. Apparatus of the nature described'comprising a vat mounted to vibrate andhaving at its bottom a longitudinal outlet, a screen rotatable in said vat, a pair of supply troughs mounted above said vat and having delivery openings extending longitudinally..

of said vat, means to vibrate said vat and means to rotate said screen.

2. Apparatus of the nature described comprisingv a vat mounted to vibrate and having at its bottom a longitudinal outlet', a screen rotatable in said vat, .a pair of troughs extending longitudinally of said screen and above the same `and having between said troughs a deector to deiect water'into said troughs, means to' direct Water from Within said screen against said deflector, means to vibrate said vat, and means to rotatesaid screen.`A l 3. Apparatus of the nature described comprising a pair of end frames one of which of said vat, a pivotally mounted llink for sustaining" said frames at the other side of said vat, said link having a leverarmgan eccentric operat'ed mechanism for eiifecting Vif bration, of said arm,'a cylindrical screen rotatable within said' vat, and means to rotate said screen.

y! RALPH s. CLARKE. 

